Which group was backed by the United States?

i belive it is:

The U.S. government explicitly planned to back the Contras, various rebel groups collectively that were formed in response to the rise of the Sandinista's

Explanation:

paul maurice zoll (july 15, 1911 – january 5, 1999) was a jewish american cardiologist and one of the pioneers in the development of the artificial cardiac pacemaker and cardiac defibrillator. he graduated from boston latin school in 1928.

it is

a

asked for and recieved from the united states